Calculating world dependencies
!!! All ebuilds that could satisfy ">=x11-base/opengl-update-2.1_pre1" have been masked.
!!! One of the following masked packages is required to complete your request:
- x11-base/opengl-update-2.1_pre3 (masked by: ~x86 keyword)

For more information, see MASKED PACKAGES section in the emerge man page or
section 2.2 "Software Availability" in the Gentoo Handbook.
!!! (dependency required by "media-video/nvidia-glx-1.0.6629-r4" [ebuild])